Hydraulic cement



UNITED STATES PATENT OFFI JOHN MURPHY, OF COLUMBUS, OHIO.

HYDRAULIC CEMENT.

SPECIFICATION forming part of Letters Patent No. 270,097, dated January 2, 1883. Application filed September 20, 1882. No specimens.)

To all whom it may concern:

Beit known that 1, JOHN MURPHY, of Oolumbus, in thecounty of Franklin and State of Ohio, have invented a new and Improved Hydraulic Cement; and I do hereby declare that the following is a full, clear, and exact description of the same.

The object of my invention is to produce a cheap hydraulic cement or water-lime, which shall be superior in tenacity and durability. The materials I employ are i onmica, soapstone, and butntpr roasted and w i are prepared and mixed inthe manner and proportions hereinafter stated. The proportionsof the ingredients are as follows: ironslag, thirty-five parts, by measure; mica si teen parts, by measure; soapstone, iourteen par sfliy measure; cla y,roaste'd": eighteen parts, by measure; lime, mm, seventeen parts, by measure. The clay is the soft blue variety, known as potters clay, which is free from sand and unctuous to the touch. The clay and lime are mixed and ground in a pug-min, a due quantity of water belngad e to slake the lime and produce a plastic mass having sufficient adhesiveness to enable it to be molded into the form of ordinary bricks. The latter should not be more than two inches thick, in order that they may dry and be quickly burned in a kiln, which operations-to wit, drying and burning-areetl'ected in the same manner as in the case of ordinary buildingbricks. The fuel suitable for burning is coke and anthracite coal,

and the burning-should not be continued to the.

pointot' vitrification, since that condition would prevent the combination of the materials which is requisite to make them waterrepellent. The clay and lime bricks, having been duly burned, are brokenup and ground with the slaggmiea, and soapstone, thus reducing all the ingredi cuts to powder, in which form the cement is ready for use in the usual manner.

I am aware that slag, lime, and pulverized brick have been used as elements of cements.

I am aware that lime and burnt clay con-' ing witnesses.

JOHB MURPHY. Witnesses:

SoLoN O. KEMON, CHAS. A. PETTIT. 

